However, network security is not only a technical problem but also a comprehensive systems engineering of security strategy, security technology and security management.

然而，网络系统安全问题不仅仅是技术的问题，而是安全策略、安全技术与安全管理的综合过程，是一项系统工程。

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Still, the shield's effectiveness as a defense in cyber-warfare is far from clear: Bruce Schneier, the founder and chief technology officer of security firm BT Counterpane, argues that no single strategy can stop determined hackers.

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